EP1354314A2 - Verfahren und vorrichtung zum erzeugen eines skalierbaren datenstroms und verfahren und vorrichtung zum decodieren eines skalierbaren datenstroms unter berücksichtigung einer bitsparkassenfunktion - Google Patents
Verfahren und vorrichtung zum erzeugen eines skalierbaren datenstroms und verfahren und vorrichtung zum decodieren eines skalierbaren datenstroms unter berücksichtigung einer bitsparkassenfunktionInfo
- Publication number
- EP1354314A2 EP1354314A2 EP02708282A EP02708282A EP1354314A2 EP 1354314 A2 EP1354314 A2 EP 1354314A2 EP 02708282 A EP02708282 A EP 02708282A EP 02708282 A EP02708282 A EP 02708282A EP 1354314 A2 EP1354314 A2 EP 1354314A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- encoder
- output data
- input signal
- blocks
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 230000036651 mood Effects 0.000 claims 1
- 230000011664 signaling Effects 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 101000873502 Homo sapiens S-adenosylmethionine decarboxylase proenzyme Proteins 0.000 description 1
- 102100035914 S-adenosylmethionine decarboxylase proenzyme Human genes 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
- G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
Definitions
- FIG. 1 An example of a scalable encoder as defined in subpart 4 (general audio) of part 3 (audio) of the MPEG-4 standard (ISO / IEC 14496-3: 1999 subpart 4) is shown in FIG. 1 , An audio signal s (t) to be coded is fed into the scalable encoder on the input side.
- the scalable encoder shown in Fig. 1 includes a first encoder 12, which is an MPEG-Celp encoder.
- the second encoder 14 is an AAC encoder that provides high quality audio coding and is defined in the MPEG-2 AAC (ISO / IEC 13818) standard.
- the Celp encoder 12 supplies a first scaling layer via an output line 16, while the AAC encoder 14 provides a second output layer.
- the scalable audio encoder also includes some other elements. First there is a delay stage 24 in the AAC branch and a delay stage 26 in the Celp branch. An optional delay can be set for each branch using both delay levels.
- the delay stage 26 of the Celp branch is followed by a downsampling stage 28 in order to adapt the sampling rate of the input signal s (t) to the sampling rate required by the Celp encoder.
- An inverse celp decoder 30 is connected downstream of the celp encoder 12, the celp-coded / decoded signal being fed to an upsampling stage 32.
- the sampled up signal is then fed to a further delay stage 34, which is referred to in the MPEG-4 standard as "core encoder or delay".
- a CoreCoderDelay D is set as a time variable other than zero, the three blocks of AAC frames nevertheless represent the same sample values No. x to No. y.
- the eight blocks of CELP frames represent sample values No. x - Fs D to No. y - Fs D, where Fs is the sampling frequency of the input signal.
- An essential feature of the MPEG-4 standard and also of other encoder standards is that the transmission of the compressed data signal should take place over a channel with a constant bit rate.
- All high-quality audio codecs work block-based, ie they process blocks of audio data (order of magnitude 480-1024 samples) to pieces of a compressed bit stream, which are also referred to as frames.
- the bitstream format must be structured so that a decoder without a priori information where a frame begins is able to recognize the beginning of a frame in order to start outputting the decoded audio signal data with the least possible delay. Therefore, each header or destination data block of a frame begins with a particular synchronization word that can be searched for in a continuous bit stream.
- Other common components in the data stream in addition to the determination data block are the main data or "payload data" of the individual layers, in which the actual compressed audio data are contained.
- bit stream format shows a bit stream format with a fixed frame length.
- the headers or determination data blocks are inserted equidistantly into the bitstream.
- the side information and main data associated with this header follow immediately behind.
- the length, i.e. Number of bits, for the main data is the same in every frame.
- Such a bit stream format is used for example in MPEG Layer 2 or MPEG-CELP.
- Fig. 5 shows another bit stream format with a fixed frame length and a back pointer or backward pointer.
- the header and page information are arranged equidistantly as in the format shown in FIG. 4.
- the start of the associated main data only occurs in exceptional cases immediately after a header. In most cases, the start is in one of the previous frames.
- the number of bits by which the start of the main data in the bit stream is shifted is transmitted by the side information variable back pointer.
- the end of this main data can be in this frame or in a previous frame.
- the length of the main data is no longer constant.
- This technique is called "Bitsparkasse" and increases the theoretical Delay in the transmission chain.
- Such a bitstream format is used for example in MPEG Layer 3 (MP3).
- MP3 MPEG Layer 3
- the technology of the bit savings bank is also described in the standard MPEG Layer 3.
- the MPEG 4 version 2 standardizes the LATM transport format, which can also transmit scalable data streams.
- the block length of the first encoder could also be half as long, but could also be one eleventh of the block length of the second encoder.
- the first encoder will generate four blocks (11, 12, 13, 14) from the section of the input signal, from which the second encoder supplies a block of data.
- a conventional LATM bitstream format is shown in FIG. 2c.
- An equidistant spacing of the output data blocks of the first encoder is usually chosen (in view of the small signaling information required) for further writing or transmission of the bit stream, as shown in FIG. 2c.
- the output data block 1 of the second encoder is filled into the remaining gaps during the transmission. Then a LATM frame is completely written, ie transmitted.
- a disadvantage of the known bit stream formats shown in FIGS. 4 to 6 is the fact that they are not suitable for scalable data streams.
- the object of the present invention is to provide a method and a device for generating a scalable data stream which is suitable for the fact that a bit savings bank function can be used for a scaling layer.
- the present invention is based on the finding that the known concept set out in FIG. 2c has to be abandoned, which consists in that all data of an output data block of the second encoder are arranged between two successive LATM headers. Instead, it is permitted that output data of the second encoder, which represent a preceding time period of the input signal, are also written after a determination data block for the current time period, this fact or how much data is still written behind the determination data block in the transmission direction special buffer information also to be transmitted is signaled to a decoder.
- buffer information is written into the scalable data stream, the buffer information indicating how far the output data of the second encoder for the preceding section extend behind the determination data block for the current section.
- the output data of the first encoder can either be written equidistantly or not in the scalable data stream, but it is desirable, for delay reasons, to enable low-delay decoding of the first scaling layer alone, i.e. only of the output data blocks of the first encoder Write data blocks equidistant and delay optimized.
- the format according to the invention also enables output data blocks of varying lengths of the second encoder to be transmitted in an equidistant grid of determination data blocks. It may make sense to select the grid for the determination data blocks and the grid for the output data blocks of the first encoder equidistantly, and in particular to choose such that a determination data block is always followed by an output data block of the first encoder.
- 2d shows a schematic illustration of a scalable data stream with low delay in the decoding of the first scaling layer
- FIG. 6 shows an example of a bit stream format with a variable frame length.
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Quality & Reliability (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10102154A DE10102154C2 (de) | 2001-01-18 | 2001-01-18 | Verfahren und Vorrichtung zum Erzeugen eines skalierbaren Datenstroms und Verfahren und Vorrichtung zum Decodieren eines skalierbaren Datenstroms unter Berücksichtigung einer Bitsparkassenfunktion |
DE10102154 | 2001-01-18 | ||
PCT/EP2002/000295 WO2002058051A2 (de) | 2001-01-18 | 2002-01-14 | Verfahren und vorrichtung zum erzeugen eines skalierbaren datenstroms und verfahren und vorrichtung zum decodieren eines skalierbaren datenstroms unter berücksichtigung einer bitsparkassenfunktion |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1354314A2 true EP1354314A2 (de) | 2003-10-22 |
EP1354314B1 EP1354314B1 (de) | 2004-08-04 |
Family
ID=7670983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02708282A Expired - Lifetime EP1354314B1 (de) | 2001-01-18 | 2002-01-14 | Verfahren und vorrichtung zum erzeugen eines skalierbaren datenstroms und verfahren und vorrichtung zum decodieren eines skalierbaren datenstroms unter berücksichtigung einer bitsparkassenfunktion |
Country Status (10)
Country | Link |
---|---|
US (1) | US7496517B2 (de) |
EP (1) | EP1354314B1 (de) |
JP (1) | JP3890298B2 (de) |
KR (1) | KR100516985B1 (de) |
AT (1) | ATE272884T1 (de) |
AU (1) | AU2002242667B2 (de) |
CA (1) | CA2434783C (de) |
DE (2) | DE10102154C2 (de) |
HK (1) | HK1056790A1 (de) |
WO (1) | WO2002058051A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7844727B2 (en) * | 2003-04-24 | 2010-11-30 | Nokia Corporation | Method and device for proactive rate adaptation signaling |
KR100647336B1 (ko) * | 2005-11-08 | 2006-11-23 | 삼성전자주식회사 | 적응적 시간/주파수 기반 오디오 부호화/복호화 장치 및방법 |
EP1841072B1 (de) * | 2006-03-30 | 2016-06-01 | Unify GmbH & Co. KG | Verfahren und Einrichtung zum Dekodieren von schichtkodierten Daten |
FR2911228A1 (fr) * | 2007-01-05 | 2008-07-11 | France Telecom | Codage par transformee, utilisant des fenetres de ponderation et a faible retard. |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3943881B4 (de) * | 1989-04-17 | 2008-07-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Digitales Codierverfahren |
US5365552A (en) * | 1992-11-16 | 1994-11-15 | Intel Corporation | Buffer fullness indicator |
DE19549621B4 (de) * | 1995-10-06 | 2004-07-01 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung zum Codieren von Audiosignalen |
US5758092A (en) * | 1995-11-14 | 1998-05-26 | Intel Corporation | Interleaved bitrate control for heterogeneous data streams |
US6092041A (en) * | 1996-08-22 | 2000-07-18 | Motorola, Inc. | System and method of encoding and decoding a layered bitstream by re-applying psychoacoustic analysis in the decoder |
KR100261253B1 (ko) * | 1997-04-02 | 2000-07-01 | 윤종용 | 비트율 조절이 가능한 오디오 부호화/복호화 방법및 장치 |
KR100261254B1 (ko) * | 1997-04-02 | 2000-07-01 | 윤종용 | 비트율 조절이 가능한 오디오 데이터 부호화/복호화방법 및 장치 |
KR100335609B1 (ko) | 1997-11-20 | 2002-10-04 | 삼성전자 주식회사 | 비트율조절이가능한오디오부호화/복호화방법및장치 |
AU1928999A (en) * | 1997-12-19 | 1999-07-12 | Kenneth Rose | Scalable predictive coding method and apparatus |
KR100354531B1 (ko) * | 1998-05-06 | 2005-12-21 | 삼성전자 주식회사 | 실시간 복호화를 위한 무손실 부호화 및 복호화 시스템 |
US6182031B1 (en) * | 1998-09-15 | 2001-01-30 | Intel Corp. | Scalable audio coding system |
US6904089B1 (en) * | 1998-12-28 | 2005-06-07 | Matsushita Electric Industrial Co., Ltd. | Encoding device and decoding device |
JP2000307661A (ja) * | 1999-04-22 | 2000-11-02 | Matsushita Electric Ind Co Ltd | 符号化装置および復号化装置 |
US6446037B1 (en) * | 1999-08-09 | 2002-09-03 | Dolby Laboratories Licensing Corporation | Scalable coding method for high quality audio |
WO2003038813A1 (en) * | 2001-11-02 | 2003-05-08 | Matsushita Electric Industrial Co., Ltd. | Audio encoding and decoding device |
-
2001
- 2001-01-18 DE DE10102154A patent/DE10102154C2/de not_active Expired - Lifetime
-
2002
- 2002-01-14 AT AT02708282T patent/ATE272884T1/de active
- 2002-01-14 CA CA002434783A patent/CA2434783C/en not_active Expired - Lifetime
- 2002-01-14 KR KR10-2003-7009508A patent/KR100516985B1/ko active IP Right Grant
- 2002-01-14 US US10/466,866 patent/US7496517B2/en not_active Expired - Lifetime
- 2002-01-14 JP JP2002558258A patent/JP3890298B2/ja not_active Expired - Lifetime
- 2002-01-14 DE DE50200750T patent/DE50200750D1/de not_active Expired - Lifetime
- 2002-01-14 WO PCT/EP2002/000295 patent/WO2002058051A2/de active IP Right Grant
- 2002-01-14 AU AU2002242667A patent/AU2002242667B2/en not_active Expired
- 2002-01-14 EP EP02708282A patent/EP1354314B1/de not_active Expired - Lifetime
-
2003
- 2003-12-11 HK HK03109020A patent/HK1056790A1/xx not_active IP Right Cessation
Non-Patent Citations (1)
Title |
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See references of WO02058051A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE50200750D1 (de) | 2004-09-09 |
KR20030076614A (ko) | 2003-09-26 |
CA2434783A1 (en) | 2002-07-25 |
JP3890298B2 (ja) | 2007-03-07 |
JP2004520739A (ja) | 2004-07-08 |
US7496517B2 (en) | 2009-02-24 |
CA2434783C (en) | 2008-04-15 |
DE10102154A1 (de) | 2002-08-08 |
AU2002242667B2 (en) | 2004-11-25 |
DE10102154C2 (de) | 2003-02-13 |
WO2002058051A2 (de) | 2002-07-25 |
WO2002058051A3 (de) | 2002-09-19 |
ATE272884T1 (de) | 2004-08-15 |
KR100516985B1 (ko) | 2005-09-26 |
US20040107289A1 (en) | 2004-06-03 |
EP1354314B1 (de) | 2004-08-04 |
HK1056790A1 (en) | 2004-02-27 |
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